Slips and tool joint for rotary well drilling



Aug. 18, 1931. F. M. ALLISON 1,819,056

SLIPS AND TOOL JOINT FOR ROTARY WELL DRILLING 7 Filed Jan; 28. 1929 2 Sheets-Sheet l FAME/48m,

ENVENTOR Aug. 18, 1931. ALLISON 1,819,056

SLIPS AND TOOL -J-0INT FOR ROTARY WELL DRILLING Filed Jan. 28, 1929 2 Sheets-Sheet 2 J f i g 9 j 9 5 jz/zmzzism, INVENTOR n? ATTO EY Patented Aug. 18, 1931 ,UINITEDIST'ATESY rnnn M. ALLISON, or oon-sIcAnA, TEXAS SLIPS AND TOOL JOINT FOR.ROTARY WELL DRILLING Application filed. January 28, 1929. Serial No. 335,679.

This invention relates to well drilling apparatus and more particularly to an improved slip and tool joint. 1

One of the objects of the invention is to L5] provide a tool joint and slips, the slips having an outer tapered surface to conformably seat the slips in a rotary well table; the tool joint also havingan outer tapered surface to conformably seat the tool joint in the slips.

Another object of the invention is to provide in the slips interlocking means for preventing one slip from movement and dislodgment out of its normal operative position in relation to its companion slip.

115} Further objects of the invention will become apparent from a perusal of the followtaken in connection ing detailed description,

and wherewith the accompanying drawings,

m: '20 Figure 1 is a vertical sectional view of an ordinary master wheel or rotary drill table, and illustrating an embodiment of the invention.

Figure 2 is a side elevational view of the lower half of the improved tool joint.

Figure 3 is a view similar to Figure 1 and illustrating a modification of the slips.

Figure 4c is a perspective view of one of the slips showing the tongue and groove formation.

Figure 5 is a top view of the slips joined together and embracing the tool joint, the broken lines indicating the joint made by the tongue and groove.

Figure 6 is a side elevational view of the slips shown in Figure 1 and showing the connection of the tongue and groove.

Figure 7 is an interior view of one of the slips shown in Figure 6 and illustrating the structural formation of the tongue and groove.

Figure 8 is a view similar to Figure 7, and

illustrating an lnterior view of one of the slips shown in Figure 3, and

Figures 9 and 10 are longitudinal sectional views of a modified form of tool joint and-- slips wherein the tool joint is seated upon the top of the slips.

Proceeding in accordance with the draw- 5 ings and wherem the difi'erent parts of the invention are indicated by numerals, 1 denotes an ordinary rotary drill table. The drill table includes the usual opening for the passageof a drill pipe and wherein is disposed a bushing 2. i Under the heavy load of a long string of pipe,'slips having a serrated or inner toothed engaging surface often cause the pipe to become necked and swaged to smaller diam-, eter, resulting in a weakened pipe which renders the pipeunfit for use.

In the present construction the slips 3 are so cut that they meet without binding the drill pipe 4:, and are turned so as to fit the bore of the bushing 2.

As depicted in the drawing, Figure 1, also Figures land 5, the slips in the present construction are seated inside the bushing and are flush with the top'of the rotary table The slips when .in assembled formation as shown in Figure 5 provide an opening 5 forthe drill pipe 4 but do not bind the pipe, due tothe annular space 6..

One of the particular objects of the inven-,, tion is to prevent one slip from being disconnected or put out of alinement with its companion slip, which might occur from jar or being bounced out of position. To prevent this, there is formed on each slip a tongue. 7 and a groove 8. This tongue and groove are" in oppositely disposed positions on each slip. This is clearly shown in Figure 4 also Figures 6 and 7. In Figure 6 the slips are illustrated connected together, the tongue 7 on one side of each slip fitting snugly in the adj acent' groove 8 of its companion slip. By this arrangement the slips will not become separated and bounce out of the table. I

In Figures 3 and 8 is shown a modification; of the slips and wherein the slips are formed with an annular shoulder 9'to more effectually seat'the slips in the bushing 2.

'A further modification of the slips is shownin Figures. 9 and 10. In this form of slip; the tool joint, (which will be again referred to and described hereinafter) is not embraced by the slips, but has its seat directly upon the slips. 1 This enables the tongue 7 and groove 8 to give more engaging surface to tlIB jOiII ZOU ing of the slip because the tongue and groove are wider.

Reference will now be made again to the tool joint which connects adjacent pieces 4 of the drill pipe. The tool joint shown in Figure 1 has an outer tapered shank or body 10 and an enlarged head 11 which provides a shoulder 12, There is also here illustrated a member 13 for enabling the old style upper half of the tool joint to be used with the present structure.

It will be observed that the tapered shank or body 10 of the tool joint is seated in and embraced by the slips and leaves an annular space 6 for clearance and to prevent binding ofthe pipe 4. v f

In Figure 3 is shown a modified form of the 7 tool joint 10 and likewise a modified form of the slip to confornitheret-o. In this modified 7 form the slips have an annular ledge or shoulder1j5 to seat the end 16 of the tool joint.

In Figure 9 the tool joint hasan enlarged lower end 17 and seats and is supported directly upon the slips 3. Figure 10 illustrates the tool joint seated in like manner upon the slips, but without the enlarged end. In both forms of tool joint shown in Figures 9 and 10, the elevator can grasp the tool joint at the point A.

Obviously the present disclosure is capable of changes other than those shown. such as will come within the scope and meaning of the appended claims.

'VVhat is claimed as new is l. Slips for use in welldrilling, said slips havingan inwardly sloped inner surface, an 5 inner surface to conformably seat a like abutting surface of a tool joint.

5. Slips for rotary well drilling having an outer tapered surface to conformably fit in a rotary well table, and having a tapered inner surface to conformably seat a like abutting surface of a tool joint, said slips havlng interlocking means to prevent one slip from 10- eating at a different elevation from the adjacent slip.

6. Slips for rotary well drilling, having an outer tapered surface to conformably fit in a rotary well table, and having an inwardly sloping inner surface to conformably seat a like abutting surface of a tool joint, said slips having an outside annular shoulder adapted to rest on the rotary well table for'supporting said'slip s. -f i 7. Slips for rotary well drilling, having an outer't'apered surfaceto conformably fit the slips in a rotary Well table, and having aninwardly sloping surface to conformably seat a like abutting surfaceofa tool joint,

said slips having in their adjacent joints a horizontally formed tongue and groove re- .spectively to prevent one slip from locating at different elevation from the adjacent slip, and having an annular shoulder to' rest on the'rotary well table for supporting said slips, said slips when assembled providing an open- ,9 ing for the drill pipe without'binding the pipe. I V i a In testimony whereof I aflix'my signature.

FRED M. ALLISON.

annular ledge formcdmidway of-the inward- V ly sloped surface, said ledge providing aseat for a tool joint; the inner surface ofthe slips below the ledge being of the same diameter.

2. Slips for rotary well drilling, having an outer tapered surface to conformably seat the slip in a rotary table, and having a tapered inner surface to seat a like abutting surface of a tool joint member said slips havingin their adjacent joints a horizontally formed tongue and groove, respectively, to

prevent one slip from locating at a different elevation from the adj acent slip.

3. Slips for rotary well drilling, having an outer tapered surface to conformably seat the slips ina rotary well table, said slips having an inwardly-sloping surface to conformably seat the like abutting surface of a tool joint;

said slips having in their adjacent joints ahorizontally formed tongue and groove, re-. spectively, to prevent one slip from locating at a different elevation from the adjacent openlng for slip, said slips, when assembled, providing an the drill pipe without binding the pipe. V v j 4. Slips for rotary'well drilling having an outer tapered surface to, conformably fit.-

in 'arotary well table, and having a tapered. 

